14k White Gold Simulated Birthstone and Cubic Zirconia Halo Stud Earrings with Child Safe Screwbacks These earrings are made of solid 14k gold, featuring high quality simulated birthstone and cubic zirconia stones. Our cubic zirconia is bright and clear with an unmatched sparkle, so it will easily convince others it's the real thing. Earrings are 7.7mm (0.3 in) wide. Central stone measures 4.5mm (0.18 in). Total carat weight: 1.00 ct.